Flash - How To Randomly Create Objects From Specific 5 Points

I am developing a mini flash game. Player control character and move left and right to collect money coin. There are 5 points that money and bomb release and move from top to bottom. When character collide with money then increase money else hit bomb age increase by 1. Once the age is 99, the game is over and the money is the final scores

Here is my code:
package Class {
import flash.events.Event;
import flash.events.KeyboardEvent;
import flash.events.MouseEvent;
import flash.media.Sound;
[Code] .....

This is my Game:
Currently, the bomb and money random appear X, 100 with 15 money and 10 bombs in a screen.
What I want is, how to amend it become money and bomb appear from specific point, after that the money and bomb when hit the wall will bounce back.
An example similar game play with my game is [URL].